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. 1984 Mar;81(5):1448–1452. doi: 10.1073/pnas.81.5.1448

Balbiani ring induction in phosphate metabolism

R Galler *, L Rydlander †, N Riedel *, H Kluding *, J-E Edström *
PMCID: PMC344853  PMID: 16593431

Abstract

Balbiani rings (BR), giant puffs in Chironomus larval salivary glands, code for giant secretory proteins. As shown earlier, the normally dominant BR2 is turned off with its putative translation product during exposure of larvae to compounds that diminish the stores of Pi. A BR6 develops from a compact chromosome band, and a new giant protein appears in the secretion as the major component. We have determined the sequence of cloned DNA fragments representative for large parts of BR1 and BR2 (normally active) and the inducible BR6. There is an excess of positive charges and high contents of serine/threonine in the coded amino acid composition for the BR1 and BR2 sequences. The coded amino acid sequence for the BR6 clone shares homologies with the others but has an excess of negative charges and lacks serine/threonine. This suggested that the Pi effects observed earlier could be related to differences in phosphorylation between the normal proteins and the BR6 product. This could be confirmed by measurements of phosphorylation, which occurs in the normal giant proteins mainly at seryl residues. P export with giant secretory protein is normally quantitatively important. Thus, BR6 activation should decrease P loss when Pi pools are lowered because of inducer action.

Keywords: cloned DNA, repetitive sequences, secretory proteins, amino acid composition, phosphoserine

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Selected References

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